Hi My name is Jean-Louis, ZS6AAG i am experimenting with uplink to the satellite with antenna logarithnic 12db, one hackrf and one ampli 2.4ghz 8 watts from china, can i attack directly the wifi amplifier or i need something between the hackrf and the wifi amplifier, many thanks for your answer

I tried LNB -> 20mKoax -> Amsat RX-Mixer -> FT-290R2. The s-meter was pinned in the right corner and i mainly heard noise, only the strongest signals were readable. Much better with 20db-ish attenuation.

Tried a different radio with better strong signal handling. No attenuation necessary. So it depends on your radio. If your radio has it, the ATTENUATOR is your friend.